Wavelength multiplexing in single-mode fiber couplers

Area of Science:

• Optoelectronics
• Fiber Optics
• Optical Communication

Background:

• Wavelength-division multiplexing (WDM) is crucial for increasing fiber optic communication capacity.
• Developing compact and tunable WDM devices is essential for advanced optical networks.

Purpose of the Study:

• To investigate theoretical and experimental aspects of a mechanically polished single-mode fiber optic coupler for WDM.
• To demonstrate the tunability of the device's center wavelength and control its selectivity.
• To analyze the device's performance parameters, including crosstalk and wavelength selectivity.

Main Methods:

• Fabrication of a single-mode fiber optic coupler using mechanical polishing.
• Implementation of variable spacing geometry for tunable operation.
• Experimental measurement of wavelength selectivity and crosstalk.
• Theoretical analysis of coupler behavior based on relevant parameters.

Main Results:

• Demonstrated wavelength selectivities ranging from 200 to 35 nm.
• Achieved crosstalk levels between 50 and 10 dB.
• Confirmed that selectivity is controlled by the interaction length of the coupler.
• Experimental results align with theoretical predictions.

Conclusions:

• The mechanically polished fiber optic coupler offers effective and tunable wavelength-division multiplexing.
• Precise control over optical device parameters is achievable through mechanical fabrication.
• This technology holds promise for enhancing optical communication systems.